Coating liquid for forming polyimide film, liquid crystal aligning agent, polyimide film, liquid crystal aligning film and liquid crystal display element

摘要

Meldrum's acid structure is introduced into each of the two precursors of the diamine compound and at least one polymer selected from a polyimide precursor obtained by polymerization reaction of a tetracarboxylic acid component and a diamine component, and a polyimide obtained by imidizing this. A polyimide film-forming coating solution containing a bifunctional compound represented by the following formula [A], a liquid crystal aligning agent comprising the coating solution, a polyimide film obtained by applying the coating solution to a substrate and baking it, The liquid crystal display element which comprises the polyimide film which consists of a polyimide bridge | crosslinked with the bifunctional compound represented by the following formula [A], the liquid crystal aligning film which consists of this polyimide film, and this liquid crystal aligning film. Wherein Y, R 1 and R 2 are groups defined in claim 1 or 4.